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Report of the Progress Committee 91
and movie screen,-''^ electrically equipped console cabinets for storing camera, projector, film, splicer, etc.,^-^ an audible footage meter, ^^'-^ and various types of incandescent and arc liglits.^^°
Sound movies in the home may now be realized since the introduction of a phonograph turn table operated from an extension shaft to the projector to maintain synchronism. ^^^ A magnetic pick-up transfers the sound record to the audio amplifying system of an ordinary radio receiver.
Scenarios, Amateur Movie Clubs. About 80 amateur photoplays were -completed by approximately twenty-five amateur clubs during the year 1928.^^^
Film Processing. Solutions for developing amateur films by the reversal method have been recommended by Henri-Robert.^®^ Two patents are of interest relating to equipment for continuous processing of amateur films. A controlled exposure^®* is given the film after the first development by passing the film over a light responsive element such as a thermopile which is excited according to the density of the film. The other patent describes a complete processing machine. ^^^
B. Color Processes
An additive process of three-color cinematography for the amateur using 16 mm. film was announced in August 1928.^^^ A threecolor filter is used on both the standard camera and projector and a series of tiny cylindrical lenses are embossed vertically on the film support. The film is threaded in the camera with the emulsion side away from the lens so that the light passes through the embossed lenses before it reaches the emulsion. Each minute lens element images the three-color filter diaphragm and thus exposes one, two, or three lines on the film according as the subject reflects one, tw^o, or all three primary colors. On projection, the lens elements and the filters serve to recombine the colors of the original subject. The film is developed by a reversal process.
In another new amateur color process, alternate color records are exposed on a film moving 26-28 frames per second, through a rotating sector wheel, each filter of which is made up of seven sectors of different colors.^®^ A reduction in color fringing and improved color rendering is claimed.